Search found 27 matches

by KRIKzz
Tue Jul 28, 2020 1:14 am
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

Re: mcd-verificator (CD core accuracy tests)

I just done small hack for remapping mcd registers area 0xA120XX and now i can run mcd via 32x. Seems it works fine, so now we know for sure that it is the only reason why mcd does not work via 32x
by KRIKzz
Mon Jul 27, 2020 4:06 pm
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

Re: mcd-verificator (CD core accuracy tests)

I made some tests with 32x and is seems like 32x does not pass data lines in memory areas related to mega cd, may be it been made to avoid bus conflicts.
by KRIKzz
Tue Jul 14, 2020 9:26 pm
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

Re: mcd-verificator (CD core accuracy tests)

This seems to indicate there are actually 32 registers in CDC chip, not 16 as described in LC591x manual, and that AR register (register index) does not reset to 0x00 when register 0xF is read but when register 0x1F is read, which again contradicts LC591x manual and is kinda unexpected. Did you con...
by KRIKzz
Thu Jul 02, 2020 8:25 pm
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

Re: mcd-verificator (CD core accuracy tests)

From what i know valid cdd status shown only when RS1 != F
by KRIKzz
Thu Jul 02, 2020 9:57 am
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

Re: mcd-verificator (CD core accuracy tests)

Hm, checksums looks ok. which one is bad?
9+F+5 ^ F = 2
9+F+1 ^ F = 6
by KRIKzz
Wed Jul 01, 2020 12:13 am
Forum: Mega/SegaCD
Topic: mcd-verificator (CD core accuracy tests)
Replies: 24
Views: 6559

mcd-verificator (CD core accuracy tests)

During cd core development i spent lot of time on figuring out how mega-cd actually works, some of my conclusions reflected in mcd-verificator diagnostics tool. I share it with hope that it will help to make better CD emulators (:

https://github.com/krikzz/MEGA-PRO/tree ... erificator
by KRIKzz
Tue Jun 30, 2020 11:17 pm
Forum: Mega/SegaCD
Topic: Diagnostic Software
Replies: 1
Views: 2435

Re: Diagnostic Software

https://github.com/krikzz/MEGA-PRO/tree ... erificator

Try this thing if you have some flashcart. It tests pretty much everything. If it not start at all then sub cpu or wram likely broken.
by KRIKzz
Thu Mar 02, 2017 10:53 pm
Forum: Megadrive/Genesis
Topic: Mega Everdrive USB programming
Replies: 6
Views: 3015

Re: Mega Everdrive USB programming

Ive done a server/client test sometime back. Although its hacky I can share some of the code if you wish. Server is written in C# and client in ASM. I used this to test streaming music files, but the connection is too slow or unreliable to work properly. Actually it should be fast enough for music ...
by KRIKzz
Wed Nov 13, 2013 3:11 pm
Forum: Demos
Topic: wolfenstein demo for sega genesis
Replies: 361
Views: 191818

Really impressive! Genny doing the work of i286 machine, which is much more powerful. Blast processing he he (:
by KRIKzz
Sun Dec 18, 2011 1:04 pm
Forum: Demos
Topic: Hello World
Replies: 5
Views: 3890

letoulousain wrote:Congratulations ! That's one small step for a man, one giant...
... leap for mankind.
my first md program was a jumping bear (:
by KRIKzz
Sun Dec 18, 2011 12:40 pm
Forum: Hardware
Topic: Add a pause button to the super magic drive for sms games...
Replies: 2
Views: 3961

Re: Add a pause button to the super magic drive for sms game

Hi all, I'm a super magic drive owner ( 2 units 16 & 24 meg) , and playing some sms game on it . As some people know , the smd has a lack of the sms pause function , very annoying with some games. I was looking at the power base converter schematics http://devster.monkeeh.com/segapage.html and thin...
by KRIKzz
Tue Jun 28, 2011 5:22 pm
Forum: Hardware
Topic: USB MegaDrive DevKit
Replies: 32
Views: 30784

prophet36 i wonder if your memory controller enough fast for 32x? while ago i used altera DE1 for build similar thing, genesis games works fine, but 32x unfortunately not. i tried to count write/read period for 32x and looks like 32x has twice more fast r/w timings than genesis dma. my first sdram ...
by KRIKzz
Fri Feb 04, 2011 10:50 am
Forum: Hardware
Topic: z80 ram in sms mode (genesis)
Replies: 2
Views: 4193

z80 ram in sms mode (genesis)

i make a dump of z80 ram in sms mode and i detected code of everdrive OS in this memory. WTF i was thinking (: so now i know that z80 in sms mode not use own 8kb ram, it use m68k ram begining from upper 32k. i always was assured that z80 use own ram in sms mode. by this reason i have had a problems ...
by KRIKzz
Mon Jan 10, 2011 7:41 am
Forum: Blabla
Topic: hai
Replies: 2
Views: 2117

Re: hai

Rawan wrote:hai all i am rawan
awesome!
by KRIKzz
Sat Jan 01, 2011 3:44 am
Forum: Hardware
Topic: Everdrive-MD Flash Cart
Replies: 24
Views: 25887

notaz wrote:
HardWareMan wrote: 10. 6MBytes ROM support (for example Kabal UMK3 hack)!
Hmh, doesn't that mean it always responds above 400000, what could cause problems with SegaCD?
there is no any problems with CD unit because looks like this cart just have not any features for mega cd (!CART wire just shorted to GND)